Facebook is planning to use London as a key hub for the development of a new WhatsApp mobile payment feature.

The story was first reported by The Financial Timesand confirmed to FORBES by a Facebook spokesperson.

Roughly one hundred people will be hired to lead a new WhatsApp payments push, meaning WhatsApp's relatively small team of 400 people will expand by around 25%, according to the FT.

The majority of the new WhatsApp software engineers will be hired in London, while a number of operations staff will be hired at Facebook's European headquarters in Dublin, Ireland.

"We're eager to work with some of the best technical and operational experts in both London and Dublin to take WhatsApp into its second decade," said Matt Idema, COO of WhatsApp, in a statement that was shared with FORBES. "WhatsApp is a truly global service and these teams will help us provide WhatsApp payments and other great features for our users everywhere."

Facebook bought WhatsApp for $19 billion in 2014 and CEO Mark Zuckerberg has been trying to think about how to monetise the platform ever since. Introducing a payments feature provides Facebook with a potential revenue stream.

WhatsApp boasts 1.5 billion users globally but the app isn't as popular in the US as it is in countries like the UK and India.

Speaking at Facebook's annual F8 conference last week, Zuckerberg said that WhatsApp mobile payments would launch in several countries in 2019 following an initial trial in India.

"When I look out at all the different ways that people interact privately, I think payments is one of the areas where we have an opportunity to make it a lot easier, that’s among the most important things that we can do here," said Zuckerberg in reference to WhatsApp payments.

"I believe that it should be as easy to to send money to someone as it is to send a photo. So we're already testing this in India with about a million people."

London has become one of the world's leading financial technology hubs over the last few years. Several fintech startups in the city are valued at over $1 billion including TransferWise, Revolut, Monzo, and Funding Circle.

WhatsApp will no doubt be looking to tap into the availability of talent that exists in the city and the company said that senior engineers from the WhatsApp founding team came to London at the end of 2018 to recruit staff, according to the FT.

Facebook picked London for the WhatsApp mobile payments push because it attracts people from countries where WhatsApp is already widely used, such as India, a Facebook spokesperson reportedly told Bloomberg.

In addition to building a WhatsApp payments function, the new hires will also aim to develop products that improve safety and limit spam on the app.